... play phonograph &record player &MM moving magnet phono ,automatically arm Descriptionlp playUSB recording function ,you can connect computerDual-channel signal ... 33-1/3,45,78 Automatically back to the arm function Professional tonearm Iron triangle of MM moving magnet cartridgeAbout ... instructions:1, tonearm counterweight, the black part towards the inside,after put on and turn down ,anti-roll-out! ...